Calgary
Canada
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Calgary, Canada

A view of the magnificent skyscrapers of the city of Calgary, Canada, on a mildly sunny day
A view of the magnificent skyscrapers of the city of Calgary, Canada, on a mildly sunny day
The first month of the autumn, September, is also an enjoyable month in Calgary, Canada, with average temperature ranging between min 4.1°C (39.4°F) and max 17.8°C (64°F).

Temperature

In September, the average high-temperature decreases, from a pleasant 22.8°C (73°F) in August, to a comfortable 17.8°C (64°F). In September, the average low-temperature is 4.1°C (39.4°F).

Humidity

In Calgary, the average relative humidity is 44.3%.

Rainfall

In Calgary, during 8.7 rainfall days, 41.7mm (1.6") of precipitation is typically accumulated. In Calgary, Canada, during the entire year, the rain falls for 68 days and collects up to 326.7mm (12.9") of precipitation.

Snowfall

January through June, September through December are months with snowfall in Calgary, Canada. September is the first month it typically snows in Calgary. Throughout September, in the average 1.3 snowfall days, it receives 39mm (1.5") of snow. In Calgary, during the entire year, snow falls for 54.3 days, and aggregates up to 1288mm (50.7") of snow.

Daylight

In Calgary, the average length of the day in September is 12.6h.

Sunshine

The average sunshine is 6.9h.

UV index

In Calgary, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in September in Calgary?

In Calgary, Canada, in September, the average high-temperature is 17.8°C (64°F), and the average low-temperature is 4.1°C (39.4°F).

What is the average humidity in September in Calgary?

The average relative humidity in September in Calgary is 44.3%.

How many days does it rain in September in Calgary?

In Calgary, Canada, in September, it is raining for 8.7 days, with typically 41.7mm (1.6") of accumulated precipitation.

When does it start to snow in Calgary?

September is the first month it typically snows. Throughout September, in the average 1.3 snowfall days, it receives 39mm (1.5") of snow.

How many hours of daylight does Calgary have in September?

The average length of the day in September in Calgary, Canada, is 12.6h.

How long on average sun shines in September in Calgary?

In September, the average sunshine in Calgary, Canada, is 6.9h.

How high is the UV index in September in Calgary?

In September, the average daily maximum UV index in Calgary is 4. A UV Index of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in September - Calgary, Canada
  • Average high temperature in September: 17.8°C

The warmest month (with the highest average high temperature) is July (23.2°C).
The month with the lowest average high temperature is January (-0.9°C).

  • Average low temperature in September: 4.1°C

The month with the highest average low temperature is July (9.8°C).
The coldest month (with the lowest average low temperature) is January (-13.2°C).

Average humidity in September - Calgary, Canada
  • Average humidity in September: 44.3%

The month with the highest relative humidity is December (55.3%).
The month with the lowest relative humidity is April (40.7%).

Average rainfall in September - Calgary, Canada
  • Average rainfall in September: 41.7mm

The wettest month (with the highest rainfall) is June (93.9mm).
Driest months (with the lowest rainfall) are January and February (0.1mm).

Average rainfall days in September - Calgary, Canada
  • Average rainfall days in September: 8.7 days

The month with the highest number of rainy days is June (13.8 days).
The month with the lowest number of rainy days is February (0.2 days).

Average snowfall in September - Calgary, Canada
  • Average snowfall in September: 39mm

The month with the highest snowfall is March (227mm).
Months with the lowest snowfall are July and August (0mm).

Average snowfall days in September - Calgary, Canada
  • Average snowfall days in September: 1.3 days

The month with the highest number of snowfall days is March (9.5 days).
The month with the lowest number of snowfall days is July (0 days).

Average daylight in September / Average sunshine in September - Calgary, Canada
  • Average daylight in September: 12.6h

The month with the longest days is June (Average daylight: 16.5h).
The month with shortest days is December (Average daylight: 8h).

  • Average sunshine in September: 6.9h

The month with most sunshine is July (Average sunshine: 10.1h).
The month with least sunshine is December (Average sunshine: 3.7h).

Average UV index in September - Calgary, Canada
  • Average UV index in September: 4

Months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is December (UV index 0).